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Microstructure And Ternary Phases In Al-rich Al-Y-Ni Alloys.

Published online by Cambridge University Press:  01 February 2011

A. L. Vasiliev ,
M. Aindow ,
M. J. Blackburn  and
T. J. Watson
A. L. Vasiliev
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
M. Aindow
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
M. J. Blackburn
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
T. J. Watson
Affiliation:
Pratt & Whitney, Materials & Process Engineering, Structural Alloys & Processes, 400 Main Street, Mail Stop 114–40, East Hartford, CT 06108, USA.
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Abstract

The results of a transmission electron microscopy study on the crystal structures and morphologies exhibited by each of the phases in a set of four Al-rich Al-Y-Ni alloys which contain 1.7–4.5 at. % Y and 3.5–10.1 at. % Ni are presented. It is shown that each alloy contains fcc-Al, a binary Al3Ni or Al3Y phase (depending on alloy composition), and a ternary phase. The same ternary phase was found in each alloy and this was found to correspond to a new phase Al19Ni5Y3 (Cmcm, a=0.4025 nm, b=0.799 nm and c= 2.689 nm, Al19Ni5Gd3 structure type). In many cases, the ternary particles also contain embedded slabs of the equilibrium Al23Ni6Y4 phase. This phase mixture did not decompose even after extended annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM5.10
Copyright
Copyright © Materials Research Society 2004

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References

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